Accrued Liabilities - Summary of Accrued Warranty Obligations (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Payables And Accruals [Abstract]
Beginning balance	$ 2,322	$ 1,470
Warranty liabilities assumed from acquisition		450
Amortization of fair value adjustment of warranty liabilities acquired through acquisitions	(8)	(12)
Reduction of warranty liabilities assumed in connection with acquisitions	(29)	(174)
Warranty expense	149	404
Warranty charges	(293)	(49)
Ending balance	$ 2,141	$ 2,089